Re: [Discuss-gnuradio] Recover the signal

[Marcus Müller]

Hi Tom, hi Maksim,

problem being that afaik we don't have stuff to parse the metadata file sink data to something matlabby. But maybe I'm wrong and someone already went and did the specific task of using the python module[1] to first parse the file and then the segment headers, and push them into a matlab-compatible storage format.

Best regards,
Marcus

[1] from gnuradio.blocks import parse_file_metadata

On 10/15/2015 04:20 PM, Tom Rondeau wrote:

On Thu, Oct 15, 2015 at 7:54 AM, Marcus Müller <address@hidden> wrote:

Hi Maksim,

you're right, the raw sample data can't contain any sideband information such as to what the USRP was tuned to.
Maybe you just want to use the "tag debug" block to print out the sample offsets at which an rx_freq tag was seen, and parse that textual information.

Best regards,
Marcus

On 10/15/2015 12:13 PM, scott tiger wrote:

Dear all,

I tried to implement the frequency hopping and I did it, But I have one problem. After stored the signal in dat file and tried to separate the frequencies in matlab "it is imposible to do that".

Can you tell me please if there is some block in GNUradio which can I use to store the changing frequency to be comparable whith the received signal to cut the received signal according to the generated frequency?

Thank you for any advice

Maksim

I'd recommend the file mete sink:

http://gnuradio.org/doc/doxygen/classgr_1_1blocks_1_1file__meta__sink.html

You can read about the file metadata format here:

http://gnuradio.org/doc/doxygen/page_metadata.html

Tom